Internal-combustion engine.



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R: G. COHEN. INTERNAL COMBUSTION ENG|NE. APPLICAHON FILED JAN. 1. 1913.

Patented Oct. 24,1916.

RUDOLF GUSTAV COHEN, 0F HAMBURG, GERMANY.

V INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented (lot. 24, 1916.

Application filed January '7, 1913. Serial No. 740,747.

To all whom it may concern Be it known that I, RUDoLr GUSTAV COHEN, a subject of the Emperor of Germany, and a residentof Hamburg, Germany, have invented new and useful Improvements in Internal-Combustion Engines, of which the following is a specification.

This invention relates to improvements in internal combustion engines and espe cially in such engines in which the driving cylinder is cooled by compressed air.

It has already been proposed to cool the driving cylinders of internal combustion or explosion engines by highly compressed or liquefied gases conducted around the walls of the cylinder and adsorbing the heat of these walls in their volatilization or expansion.

In accordance with the presentinvention compressed atmospheric air is also employed for this purpose, but the arrangn ment is such that the air particularly in muticylinder engines becomes operative in expanding step-by-step so that its heat absorbing properties are completely utilized. This is rendered possible owing to the fact that the cylinders are jacketed and the compressed air is allowed to enter the space between the cylinder and the jacket, and moreover, the inlets and outlets, that is to say the connections between the jackets, are made so narrow that the compressed air in passing from one chamber to the other un- 'dergoes a considerable drop or decrease in pressure that is'to say that the pressure of the compressed air entering the first chamber cannot fall directly to the pressure or tension of the atmosphere in this chamber itself. The air is preferably compressed by a compressor operated by the engine itself and cooks are preferably interposed between the connections of the chamber of the jacket whereby the expansion conditions can be regulated.

Although the air is heated by the compression and work is required for the compression which must be supplied by the engine the cooling with step-by-step expansion presents an advantage and the machine is more efficient than if the cylinders were uncooled.

In single cylinder engines the jacket can be arranged in such a manner as to form cells or chambers around the cylinder so that the air expands step-by-step in its passage through them.

The invention is illustrated by way of example in the accompanying drawing, in which the cylinders are contained in a casing which is divided by the vertical partitions j illustrated in four chambers a, a a a each containing a cylinder. The air is compressed by the rotating pump 0 driven by the driving shaft 7) and in the first place forced into the widened portion (Z of the pipe (Z from which it passes into the chambers atac". The partitions between the chambers present alternatively above and below a discharge and admission aperture 70, so that the air is obliged to pass completely through the chambers. The combustion'gases enter the pipe in which finally conducts the expanded air from the chamber a and by their eject'orlike action exert suction on the compressed air thereby still further increasing its effect.

f are pipes flaring hopper-fashion and conducting the atmospheric air directly to the valves and other parts to be dooled.

I claim:

1. In an internal combustion engine a cylinder, serially connected chambers surrounding the same, means for conveying compressed air to the chambers and con tracted passages connecting said chambers, whereby the compressed air is progressively expanded in passing from chamber to chamber, substantially as described.

2. In an internal combustion engine a cylinder, and serially connected chambers surrounding the same, means for conveying compressed air to the chambers, passages for conveying the compressed air to the several chambers whereby it is progressively expanded from one to the other of said chambers and means for aiding the exhaust of said air, substantially as described.

3. In an internal combustion engine, a cylinder and serially connected chambers surrounding the same an air compressor operated. by the engine and connected witl one of the cylinders, and contracted pasa sages connecting the chambers whereby the air is progressively expanded, substantially as described. RUDOLF GUSTAV COHEN. Witnesses: 3

Max F. H. KAEMPFF, EARNEST H. L. MUMMEN-IIOFF. 

